Seamless gas cylinders
01 / 40L Oxygen Cylinder
Seamless Cylinders Built to ISO 9809
Seamless steel cylinders for industrial, medical, CNG and fire-fighting supply, with valves matched to each cylinder specification.
Matched valves
02 / 50L Argon Cylinder
A valve and cylinder that arrive as one system.
Our valve range covers the specifications that fit our cylinders, so you confirm one configuration instead of two.
Export-ready supply
03 / 10L Nitrogen Cylinder
Documentation and packing handled for export.
Cylinders ship in bulk, on pallets or in cartons, with certification documents provided to meet destination requirements.
ISO 9809-1 / -3
Cylinder supply follows the seamless steel cylinder standards.
Valves matched
Valve specifications matched to each cylinder.
Product range
Cylinders by application.
Industrial, medical and fire-fighting cylinders, supplied with matched valves.
Industrial Gas Cylinders
40 L and 50 L seamless steel cylinders for oxygen, argon and nitrogen service.
Medical Gas Cylinders
Compact seamless cylinders for medical oxygen supply.
CNG and Fire-Fighting
High-pressure and special-application cylinders supplied to your specification.
Valves
Valve range matched to our cylinder specifications.
Seamless gas cylinder and valve supply
Seamless Gas Cylinders and Valves
Export supplier based in Hainan, China. Cylinders built to ISO 9809-1 and ISO 9809-3, with valves matched to each specification.
Certification documents available for destination-country requirements.
40 L – 50 L
Cylinder sizes
ISO 9809-1 / -3
Manufacturing standards
Destination documents
Certification on request
Product focus
50L Argon Cylinder
200 bar working pressure, 34CrMo4 steel, manufactured to ISO 9809-1.
Applications
Industrial, medical, fire-fighting
Materials
37Mn and 34CrMo4 steel
Export
Bulk, pallets, cartons
Seamless steel cylinders ready for export packing.
Spring edit / daily carry
Why buyers work with us
Specifications first, then everything else.
Every quotation starts with the gas, the pressure and the destination, because those decide the cylinder and the valve.
01 / Standards1
Built to ISO 9809-1 and ISO 9809-3
Seamless steel cylinders manufactured to the standards buyers specify.
37Mn / 34CrMo4
02 / Matching2
Valve matched to the cylinder
One configuration to confirm, not two suppliers to reconcile.
Valve / cylinder
03 / Export3
Documentation for the destination
Certification documents can be provided to meet destination-country requirements.
Documents / packing
Product range
Cylinders we supply
Industrial, medical and special-application cylinders, each quoted with a matched valve.
Cylinder sizes and options are confirmed per order.
View all productsSeamless Steel Cylinders
10L Seamless Steel Nitrogen Cylinder
New seamless steel nitrogen cylinder, 10 L water capacity and 150 bar working pressure, made from 37Mn steel to ISO 9809-3. Supplied with a steel handle cap, customizable valve, and bulk, carton or pallet packaging.
Seamless Steel Cylinders
40L Seamless Steel Oxygen Cylinder
New seamless steel oxygen cylinder, 40 L water capacity and 150 bar working pressure, made from 37Mn steel to ISO 9809-3. Valves are customizable; round or tulip caps; bulk or pallet packaging.
Seamless Steel Cylinders
50L Seamless Steel Argon Cylinder
New seamless steel argon cylinder, 50 L water capacity and 200 bar working pressure, made from 34CrMo4 steel to ISO 9809-1. Valves are customizable; round or tulip caps; bulk or pallet packaging.
Specifications
What the numbers mean.
Working pressure, test pressure and water capacity decide what a cylinder can carry and how it is filled.
Working pressure
150 bar and 200 bar cylinders in the current range.
Test pressure
250 bar and 300 bar test pressure on the respective models.
Water capacity
10 L, 40 L and 50 L cylinders.
Guides
Buying guides and standards notes
Practical notes on choosing cylinders, reading standards and shipping gas cylinders.
View all guidesFeatured guideOct 30, 2026Shipping & Sourcing
Shipping Gas Cylinders From China
Whether the cylinders ship empty or filled decides the packing, the documents and the hazard class. What to confirm before the container leaves.
Latest guides
Oct 30, 2026Applications & Safety
Oxygen Cylinder Safety FAQ
What an oxygen cylinder is, how to check it before filling, how to store it, and three common misconceptions that lead to unsafe handling. Check them first.
Oct 30, 2026Standards & Compliance
Cylinder Standards: ISO, DOT, TPED
ISO 9809 sets how the cylinder is built; DOT covers US filling; TPED covers placing it on the EU market. Four questions decide the route, so ask them first.
Buyer questions
Questions buyers ask before ordering
Quick answers on standards, valve matching and documentation.
Still need help? Send us a note with the gas, the pressure and the destination.
Product updates
New sizes and specifications.
Occasional notes on new cylinder sizes, valve options and documentation changes.
Contact
Contact Seamless Cylinder Co.
Tell us the gas, the working pressure, the quantity and the destination port. We will confirm the cylinder and valve configuration that fits.
Email
icelu0604@gmail.com
Phone
+86 182 4933 3922
Office
Meilan District, Haikou City, Hainan Province, China
Hours
Mon–Fri, 9:00–18:00 (GMT+8)
Inquiry intake
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